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GENERAL SCIENCE 



It is the brightest planet because the reflecting power of the surface 

 so great. When seen close to the sun at sunset it is called the 

 [( Evening Star/' and when it appears in the east at sunrise it is 

 called the " Morning Star." 



The head of a 

 comet. 



The comet 

 of 1918 



The effects of heating and 

 cooling an apple 



FIG. 362. 



Am. Mus. Nat. Art. 



FIG. 363. The Cape York meteorite which weighs 36.5 tons. 



Mars. Mars sometimes appears in the sky reddish in color. 

 Because of this appearance, the planet has received the name of the 

 Roman war god, Mars. Mars is very interesting to us because the 

 planet is much like our own. It is possible that people live on this 

 planet. The day is about the length of ours. It has a north pole 



